Why species and subspecies?

This publication has 13 references indexed in Scilit:

• Unidirectional Spread of Secondary Sexual Plumage Traits Across an Avian Hybrid Zone
  Science, 1993
• Comparisons among morphological characters and between localities in the Chorthippus parallelus hybrid zone (Orthoptera: Acrididae)
  Philosophical Transactions Of The Royal Society B-Biological Sciences, 1991
• Restricted Gene Flow in a Moving Hybrid Zone of the Newts Triturus cristatus and T. marmoratus in Western France
  Evolution, 1991
• The evolution of mating preferences and the paradox of the lek
  Nature, 1991
• The Genetic Structure of the Hybrid Zone between the Fire-Bellied Toads Bombina bombina and B. variegata: Comparisons between Transects and between Loci
  Evolution, 1991
• Female Preference Predates the Evolution of the Sword in Swordtail Fish
  Science, 1990
• Genetics and Language in European Populations
  The American Naturalist, 1990
• Analysis of Hybrid Zones
  Annual Review of Ecology and Systematics, 1985
• GENETIC DRIFT IN A CLINE
  Genetics, 1975
• Sex ratio and unisexual sterility in hybrid animals
  Journal of Genetics, 1922